It seems the Street is getting behind two of Cramer's favorite spec plays.

"After a pronounced but brief period of underperformance, two of my favorite speculative ideas for 2013, airlines and mortgage insurers are coming back," said Cramer on Monday's broadcast.

Airlines

Looking at the airlines, new research seems to confirm that pros are growing substantially more bullish on the sector; largely because the recent consolidation has generated a better supply versus demand dynamic. In turn airlines can charge higher prices.

Just this week, analysts at Deutsche Bank issued new research which said the airlines were on track to more than double March operating profit.

And in the space, "Deutsche is predicting 42% upside for Delta," Cramer said with enthusiasm.

Those same Deutsche analysts are also looking for gains elsewhere in the sector. "They expect a 37% increase for United Continental, 32% for Southwest and 27% for US Airways," Cramer added.

Looking at another favorite theme, Cramer noted that Macquarie just upgraded Radian, as a favorite stock in the mortgage insurers group increasing the rating from Neutral to Outperform. "They said it has tremendous earnings momentum," Cramer explained.

In an improving real estate market, Cramer believes companies that write mortgage insurance are in the sweet spot.

That is, as more people buy homes more people will need mortgage insurance. And with tighter lending standards, those that qualify for mortgages are in a stronger financial position.

Also, Cramer believes that Radian is perhaps the best in this business.